After tearing the intake manifold off the g20 the other day, I noticed the highport tb I was using on it had 2 vac ports on the bottom, I had looped these apparently on that car, well before this, a few months ago or so I found one of these on my car, so I plugged it. Well I should have looked harder cause there's 2!! so I looped em with a small piece of tight fitting vac hose, hopefully that will make a noticeable gain